Color-screening glass



July 2Q, 1930. T. SUZUKI ET AL COLOR SCREENING GLASS Filed NOV.A4, 1926 y z gvwewoz s f 35% QMOWWJ: Ww

Patented July 29, 1930 UNITED STATES PATENT OFFICE TSUNEO SUZUKI AND SUEO SAK'URAI, OF KOISHIKAWA-KU, TOKYO, JAPAN, ASSIGNOBB TO ZAIDAN HOJ'IN RIKAGAKU KENKYUJO, OF TOKYO, JAPAN COLOR-SCREENING GLASS Application led November 4, 1926, Serial No. 146,276. and in Japan June 15, 1928.

This invention relates to a color screening ,glass comprising two combined lenses each ot' which is plane at the facing: side or the surface of combination, while plane. concave or convex at the other side, the facing or plane surface of onel of the lenses is partly coated with transparent coating material dissolving dyestutt` or dyestutts which absorb or screen dizzy rays upon eyes and also dissolw ing dyestutf or dyestufls which absorb or screen injurious rays upon eyes. The olnect of the invention is to obtain a color screening glass by which not only dizzy and injurious rays can be effectively absorbed or screened, hut-also a clear and pleasant sensation can be obtained.

In the accompanying drawings:

Fig. l shows a perspective View ot a pair of glasses accordingr to the invention. and

Fig. 3. n, c, d. e and f show sections of six examples of lenses used for the. glass uceordiner to the invention,

In the drawings, 1 and 2 are lenses which are coupled or combined in their respective plane surfaces. The other side of each oi the lenses is any desired torni ot' plane. convex. or concave. Thus, various *forms of combination such as shown in o. 7). c, rl, f and f in Fig. 2 may be obtained. A part ot the plane facingsurface otone ot the. lenses. say olf lens l, is coated with transparent coatingr inat-erial dissolving dyestuff or dyestutls which absorb or screen rays having dizzy ell'eet upon eyes and also dissolving dyestutt' or d vestutl'a which absorb or screen injurious rays` upon eyes. For example, gelatine. nii-nnb. ete. may be used as the transparent routine' unite rial, and methyl violet or methylen blue and any other colors may be used as the dyest utl'i; for screening rays havingr dizzy etl'eet such as Search lights used in war, head lights ol'l motor cars or strong flame in welding'operaiion. ete.. while ultrazin prepared by a process described in U. S. application Serial No. 731.488. liled August 11, 1924-. now Patent No. 1.684.562 dated September 18, '1928 may be` used to screen injurious rays such as ultraviolet ray. In the example shown, upper half 3 ot the one of the facing surfaces colored with such colored coatingz while the rest or lower halt' 4 thereof is left without any treatment. Instead et leaving the lower part 4 untreated. it may be coated with transparent coatin material of pleasant light color such as vell low. Of course, the colored part 3 and thevu'ncolored or light colored part 4 may be reversed according: to the purpose of users in eases.

In the known antiglare glass, the lenses are colored equally all over the surface with metallic compound (inorganic compound) rather iu denser color to avoid the glare, and therefore there is a draw back that the sight given by such a glass is very dark all oyer the vision so that it is very inconvenient tor night use` or tor working with any flame or are ot glare.

In the improved glass of this` invention, the lenses are partly colored by ditlerent colors denser and li'rhter, and therefore bv a small movement ot eye-hall. not only anv dizz v and injurious rays from any object can he screened. but also clear and pleasant sight 'for other objects can be easily obtaineduat will. so that the improved Iglass can be etliciently used tor ehaull'eurs. aerial-navigators. worlniien in weldinpor sinelting factories. inotuitaiueers. skiers or `sltateineu or any other users who wish to escape from the detrimentsI ot' dizzy and injuriousravs. I

l. .X color screening4 glass comprising' two coupled or combined lenses eaeh of which is plane in the lacing;r or coupling.r surface.I the. upper hall only ot' the. plane or couplingT surtaee of one of the lenses being coated with a transparent solvent containingY ultraziu.

i2. color screening glass. comprising two coupled or combined lenses each of which is plane iu the facing! or coupling surface, the upper ha lt' only et the plane or coupling suru face otl one ot' the lenses being coated with a transparent solveutcontaining one or more of dro-ftutl's whieh screen dizzy ravs upon the eyes. and also ultraziu. f 'l i In testimoniv whereof we alix our signatures.

TSUNEO SUZUKI. .SITIO SAKITRAI. 

